I'm confused with XenServer... I plan to buy a Dell R710 server and run XenServer on it. Dell can sell me a XenServer license with the server, I can choose between XenServer Express and Xen Server Enterprise. When I look at Citrix Web Site they talk about "XenServer" and "Citrix Essentials for XenServer". So, what's the difference between Dell's Express/Enterprise edition and Citrix Xenserver/Essentials?

2 Answers
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XenServer is free, Essentials and Enterprise cost some $$$. This page here (link) is the best for showing the features across the 3 editions.

Edit: Your post doesn't elaborate on the situation for your virtualization project, but I'd recommend starting with the free XenServer first. Should you need the additional features immediately, then perhaps Dell would be best as they're assembling your server.

Edit (again): AFAIK, XenCenter is free with XenServer, but I believe that once you move up to essentials or enterprise there are costs involved. I can't speak accurately about this issue but for the free edition, it is free with limitations.